Assuming it's not an iPhone that she has, just switch on bluetooth. Works with a very large percentage of "dumbphones" and "smartphones", including - according to Wikipedia - most Sharp, Motorola, Samsung, Sony Ericsson, HTC and Nokia phones with bluetooth. No "app for that" needed.

Very nice and welcome additions, though all of this should have been in from the get-go. And of course, now that they are, the self-deceivers can finally stop saying how unnecessary these things were. Throw in SMB networking (not WebDav), Bluetooth file transfers, and decent video recording and we're there.